Cobalt Drill

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I need to know what is the best drill bit to drill a hole in a bolt that broke off on my truck engine so can take it out with an easy out. I'm using a high speed Dremal drill with a cobalt drill bit and it's not doning anything. Just don't know what to do now. Thanks

It needs to turn slow, using a drill or Dremal that turns fast will not do anything except dull the drill bit. Use a small drill bit to start a "pilot hole" and move up to the next size, then another size. Keep doing this until you get to the size of the easy out. Don't apply a lot of pressure with the small drill bit because you will break the bit. I use cheap drill bits alot because they are always dulling, so it doesn't matter what brand of bits you use, it's all in the method of your drilling. So buy or borrow a regular brill and only press the trigger in like half way. Anything to get the drill to turn slowly enough to were it will cut but not lock up. Hope this helps.